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April 18, 2015

April 18, 2015

Posted by **suzy** on Tuesday, November 28, 2006 at 11:47am.

Let V be the initial ground speed and 2V be the final ground speed, in miles per minute.

The length of time travelled at the higher speed was 120 - 40 = 80 minutes

Total distance travelled =

160 = 40 V + 80*(2V) = 200 V

V = 0.8 miles/minute

Inital distance travelled at velocity V = 0.8 miles/min* 40 min = 32 miles

Final distance travelled at velocity 2V = 80*1.6 = 128 miles

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